Burner having variable output structure

ABSTRACT

An object of the present invention is to provide a burner having variable output structure that maintains the speed of a mixture injected through flame holes at a predetermined speed or more by supplying gas through a gas valve at a predetermined pressure or more, and prevents the occurrence of backfire at a low output by adjusting an opened area of the flame holes. In order to achieve the object, according to the present invention, a burner having variable output structure includes a flame-hole plate that includes a plurality of flame holes formed on the surface thereof exposed to a combustion chamber, and a flame hole adjusting unit that changes an output by adjusting the size of each flame hole according to load required in a combustion device.

TECHNICAL FIELD

The present invention relates to a burner having variable outputstructure, and more particularly, to a burner having variable outputstructure that can adjust an output of a burner by adjusting theposition of a flame-hole plate.

BACKGROUND ART

In general, according to a method of burning gas fuel in a gas boiler,in the case of a premixed burner, gas and air are mixed in advance witheach other at a mixture ratio corresponding to optimum combustion, andthen supplied to a flame-hole surface so as to be burned.

FIG. 1 is a schematic view showing the structure of a general burner inthe related art.

A burner includes a gas valve 10 that adjusts the pressure of gassupplied to the burner, a nozzle 20 that injects the gas suppliedthrough the gas valve 10, a mixture inlet 30 through which the gasinjected from the nozzle 20 is mixed and supplied, an inner space 41 ofthe burner 40 to which the mixture supplied through the mixture inlet 30is supplied, and a flame-hole plate 42 that includes a plurality offlame holes 42 a in order to inject the mixture supplied to the innerspace 41 to a combustion chamber (not shown).

When load required in a combustion device is large, the gas valve 10 iscontrolled so that the gas is supplied to the burner at high pressurefor the purpose of high output of the burner. In contrast, when the loadrequired in the combustion device is small, the gas valve is controlledso that the gas is supplied to the burner at low pressure for thepurpose of low output of the burner.

In this case, the speed of the mixture, which is injected into thecombustion chamber through the flame holes 42 a, depends on the gaspressure that is determined by the control of the gas valve 10. That is,if the gas pressure is high, the speed of the mixture injected throughthe flame holes 42 a is high.

However, according to the burner having the above-mentioned structure,when the load required in the combustion device is small, if the gas issupplied at low pressure, flames are generated on the inner surface ofthe flame-hole plate 42 facing the inside of the combustion chamber. Asa result, there is a problem in that combustion is abnormally performed.

That is, if the speed of the mixture injected through the flame holes 42a is a predetermined speed or less, backfire where flames are generatedin the flame holes 42 a occurs.

DISCLOSURE OF INVENTION Technical Problem

The present invention has been made to solve the above-mentionedproblem, and an object of the present invention is to provide a burnerhaving variable output structure that maintains the speed of the mixtureinjected through flame holes at a predetermined speed or more bysupplying gas through a gas valve at a predetermined pressure or more,and prevents the occurrence of backfire at a low output by adjusting anopened area of the flame holes.

Technical Solution

In order to the above-mentioned object, according to the presentinvention, a burner having variable output structure includes aflame-hole plate that includes a plurality of flame holes formed on thesurface thereof exposed to a combustion chamber, and a flame holeadjusting unit that changes an output by adjusting the size of eachflame hole according to load required in a combustion device.

In this case, the flame-hole plate may be formed of a stationaryflame-hole plate that includes stationary flame holes and is not moved.The flame hole adjusting unit may be formed of a movable flame-holeplate that is disposed to come in contact with the stationary flame-holeplate, includes a plurality of variable flame holes at positionscorresponding to the stationary flame holes of the stationary flame-holeplate, and is moved to adjust the amount of the mixture injected throughthe stationary flame holes.

The burner having variable output structure may further include adriving unit for changing the position of the movable flame-hole platewhile the movable flame-hole plate comes in contact with the stationaryflame-hole plate.

Advantageous Effects

As described in detail above, the burner having variable outputstructure according to the present invention can obtain an advantage ofstably performing combustion without backfire even at a low output byadjusting the size of the flame hole that is formed in the flame-holeplate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing the structure of a general burner inthe related art.

FIG. 2 is a schematic cross-sectional view of a flame-hole plate of aburner according to an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing that a movableflame-hole plate is moved by a driving unit in the structure shown inFIG. 2.

BEST MODE FOR CARRYING OUT THE INVENTION

The structure and operation of a preferred embodiment of the presentinvention will be described in detail below with reference toaccompanying drawings.

FIG. 2 is a schematic cross-sectional view of a flame-hole plate of aburner according to an embodiment of the present invention, and FIG. 3is a schematic cross-sectional view showing that a movable flame-holeplate is moved by a driving unit in the structure shown in FIG. 2.

The present invention relates to a burner that can freely adjust anoutput thereof by adjusting the size of a flame hole through which themixture is injected while the pressure of gas is maintained constantly.

Referring to FIG. 2, like in the related art, there is provided astationary flame-hole plate 110 that includes a plurality of stationaryflame holes 110 a formed on the surface thereof exposed to a combustionchamber. The stationary flame-hole plate 110 is not moved unlike amovable flame-hole plate 120 to be described below, and has the sameshape and structure as the flame-hole plate 42 shown in FIG. 1.

It is possible to adjust the amount of the mixture, which is injectedthrough the stationary flame holes 110 a, by adjusting the size of eachflame hole. That is, if the size of each stationary flame hole 110 athrough which the mixture is injected is adjusted while the pressure ofgas supplied through the gas valve 10 shown in FIG. 1 is maintainedconstantly, gas can be supplied so that combustion is stably performedat a low output without a reduction of the pressure of gas to besupplied.

For this purpose, a flame hole adjusting unit, which adjusts the size ofeach stationary flame hole 110 a, needs to be provided.

The flame hole adjusting unit may include, for example, a movableflame-hole plate 120 including variable flame holes 120 a, and a drivingunit 130 that changes the position of the movable flame-hole plate 120.

The movable flame-hole plate 120 is disposed to come in contact with onesurface of the stationary flame-hole plate 110, and includes variableflame holes 120 a at positions corresponding to the stationary flameholes 110 a of the stationary flame-hole plate 110 so that the number ofthe variable flame holes 120 a is equal to that of the stationary flameholes 110 a.

In this case, when the position of the movable flame-hole plate 120 ischanged, the positions of the variable flame holes 120 a correspondingto the stationary flame holes 110 a are changed, so that an opened areaof the stationary flame holes 110 a is changed. Therefore, the amount ofthe mixture, which is injected through the stationary flame holes 110 a,is adjusted.

The driving unit 130 may be, for example, a stepping motor (not shown)that is coupled with the movable flame-hole plate 120. Accordingly, ifthe R.P.M. (revolutions per minute) of the stepping motor is controlledaccording to load required in a combustion device, the movement distanceof the movable flame-hole plate 120 is adjusted. As a result, the openedarea of the stationary flame holes 110 a is changed, so that the outputof the burner is adjusted.

That is, when a high output is required, the position of the movableflame-hole plate 120 is controlled so that the stationary flame holes110 a are opened as shown in FIG. 2. When a low output is required, theposition of the movable flame-hole plate 120 is controlled so that thestationary flame holes 110 a are closed as shown in FIG. 3.

According to this structure, even if a low output is required in thecombustion device, the speed of the mixture injected through thestationary flame hole 110 a can be maintained at a predetermined speedor more because the pressure of gas is maintained at a predeterminedpressure or more. Therefore, it is possible to prevent the occurrence ofbackfire where flames are generated at the inside of the stationaryflame hole 110 a.

Meanwhile, the movable flame-hole plate 120 has been controlled by thedriving unit 130 in the embodiment shown in FIGS. 2 and 3. However, itis apparent to those skilled in the art that the movable flame-holeplate 120 may be manually moved without the driving unit 130.

Although the present invention has been described in connection with theexemplary embodiments of the present invention, it will be apparent tothose skilled in the art that various modifications and changes may bemade thereto without departing from the scope and spirit of theinvention.

1. A burner having variable output structure, the burner comprising: aflame-hole plate that includes a plurality of flame holes formed on thesurface thereof exposed to a combustion chamber; and a flame holeadjusting unit that changes an output by adjusting the size of eachflame hole according to load required in a combustion device.
 2. Theburner having variable output structure according to claim 1, whereinthe flame-hole plate is formed of a stationary flame-hole plate thatincludes stationary flame holes and is not moved, and the flame holeadjusting unit is formed of a movable flame-hole plate that is disposedto come in contact with the stationary flame-hole plate, includes aplurality of variable flame holes at positions corresponding to thestationary flame holes of the stationary flame-hole plate, and is movedto adjust the amount of a mixture injected through the stationary flameholes.
 3. The burner having variable output structure according to claim2, further comprising: a driving unit that changes the position of themovable flame-hole plate while the movable flame-hole plate comes incontact with the stationary flame-hole plate.